CVV has string type?

The CVV type (using the GeoEngine.Core.GXNet lib in C#) includes SetString and GetString methods, but CVV.Create and CVV.CreateExt seem only to support various numerical types, from the GSTypesConstant and GEO_VARConstant enumerations..
How does one create a CVV that includes strings? This would be to add notes, comments, etc., to survey data.

Thanks,

Bob

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